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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-28158] SnapshotThread should stop using LogicalClock to trigger snapshots</title>
                <link>https://jira.mongodb.org/browse/SERVER-28158</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Since it can advance without any writes.&lt;/p&gt;

&lt;p&gt;Code in question:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.3/src/mongo/db/repl/oplog.cpp#L1196&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.5.3/src/mongo/db/repl/oplog.cpp#L1196&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Rationale:&lt;br/&gt;
getLastSetTimestamp gives you the last set logical time from the LogicalClock. With the implementation of the Lamport clock, the clock can advance even without any operations being applied. This will also avoid the following scenario:&lt;/p&gt;

&lt;p&gt;0. Secondary is replicated till ts = T9.&lt;br/&gt;
1. Primary created new op with ts = T10.&lt;br/&gt;
2. Secondary got message from Primary and advanced clock to T10.&lt;br/&gt;
3. Secondary snapshot thread noticed time changed to T10 and started taking snapshot.&lt;br/&gt;
4. Secondary has only applied till T9, so it gets a snapshot of T9.&lt;br/&gt;
5. Secondary applies oplog entry with T10.&lt;br/&gt;
6. Secondary gets a read with readConcern majority and afterOpTime T10.&lt;br/&gt;
7. Read times out since the snapshot is in T9 and snapshot thread does not create new snapshot because it thinks the time time is already in T10.&lt;/p&gt;

&lt;p&gt;Also note that the newTimestampNotifier will also need to change to trigger after the actual applied/generated opTime was changed (as opposed to the LogicalClock)&lt;/p&gt;</description>
                <environment></environment>
        <key id="359765">SERVER-28158</key>
            <summary>SnapshotThread should stop using LogicalClock to trigger snapshots</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Mar 2017 19:35:02 +0000</created>
                <updated>Wed, 5 Apr 2017 11:34:47 +0000</updated>
                            <resolved>Tue, 7 Mar 2017 19:15:27 +0000</resolved>
                                    <version>3.5.3</version>
                                    <fixVersion>3.5.5</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1518138" author="xgen-internal-githook" created="Tue, 7 Mar 2017 19:14:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28158&quot; title=&quot;SnapshotThread should stop using LogicalClock to trigger snapshots&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28158&quot;&gt;&lt;del&gt;SERVER-28158&lt;/del&gt;&lt;/a&gt; SnapshotThread should stop using LogicalClock to trigger snapshots&lt;/p&gt;

&lt;p&gt;Note: This is a temporary band aid since the snapshot thread is slated for removal soon.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/47365c5eecd58116088f5e07a75b9e051dc4e9eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/47365c5eecd58116088f5e07a75b9e051dc4e9eb&lt;/a&gt;&lt;/p&gt;</comment>
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